[net-next 02/15] ice: Use the software based tail when checking for hung Tx ring

[Jeff Kirsher]

From: Brett Creeley <brett.cree...@intel.com>

Currently in ice_get_tx_pending we try to read a Tx ring's tail. This is
then compared with the software based head (next_to_clean) to determine
if we have pending work. This will never work because reading of the Tx
ring's tail is no longer supported. Fix this by using the software based
tail (next_to_use) to determine if there is pending work.

Signed-off-by: Brett Creeley <brett.cree...@intel.com>
Tested-by: Andrew Bowers <andrewx.bow...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c 
b/drivers/net/ethernet/intel/ice/ice_main.c
index f9f81307dac8..f6926cbb48a4 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -41,12 +41,12 @@ static void ice_update_pf_stats(struct ice_pf *pf);
  * ice_get_tx_pending - returns number of Tx descriptors not processed
  * @ring: the ring of descriptors
  */
-static u32 ice_get_tx_pending(struct ice_ring *ring)
+static u16 ice_get_tx_pending(struct ice_ring *ring)
 {
-       u32 head, tail;
+       u16 head, tail;
 
        head = ring->next_to_clean;
-       tail = readl(ring->tail);
+       tail = ring->next_to_use;
 
        if (head != tail)
                return (head < tail) ?
-- 
2.21.0